Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['q', 'U', '8975', '937', 'H', 'Z', '7015', '193', '4353']

17, 21, 8975, 937, 8, 26, 7015, 193, 4353